Zentralinstitut für Genetik und Kulturpflanzenforschung der Akademie der Wissenschaften der DDR, Corrensstrasse 3, DDR-4325, Gatersleben, German Democratic Republic.
Planta. 1987 Oct;172(2):214-8. doi: 10.1007/BF00394590.
The capability to reassimilate CO2 originating from intracellular decarboxylating processes connected with the photorespiratory glycolate pathway and-or decarboxylation of C4 acids during C4 photosynthesis has been investigated with four species of the genus Flaveria (Asteraceae). The C3-C4 intermediate species F. pubescens and F. anomala reassimilated CO2 much more efficiently than the C3 species F. cronquistii and, with respect to this feature, behaved similarly to the C4 species F. trinervia. Therefore, under atmospheric conditions the intermediate species photorespired with rates only between 10-20% of that measured with F. cronquistii. At low oxygen concentrations (1,5%) the reassimilation potential of F. anomala approached that of F. trinervia and was distinct from that found with F. pubescens. The data are discussed with respect to a possible sequence of events during evolution of C4 photosynthesis. If compared with related data for C3-C4 intermediate species from other genera they support the hypothesis that, during evolution of C4 photosynthesis, an efficient capacity for CO2 reassimilation evolved prior to a CO2-concentrating mechanism.
已经研究了四个斑鸠菊属（菊科）物种重新同化来自与光呼吸甘氨酸途径和/或 C4 光合作用中 C4 酸脱羧相关的细胞内脱羧过程的 CO2 的能力。C3-C4 中间种 F. pubescens 和 F. anomala 比 C3 种 F. cronquistii 更有效地重新同化 CO2，并且就这一特征而言，其行为类似于 C4 种 F. trinervia。因此，在大气条件下，中间种的光呼吸速率仅为 F. cronquistii 测量值的 10-20%。在低氧浓度（1.5%）下，F. anomala 的再同化潜力接近 F. trinervia，与 F. pubescens 的再同化潜力不同。这些数据是根据 C4 光合作用进化过程中可能发生的一系列事件进行讨论的。如果将其与来自其他属的 C3-C4 中间种的相关数据进行比较，它们支持这样的假设，即在 C4 光合作用的进化过程中，在 CO2 浓缩机制之前，出现了一种有效的 CO2 再同化能力。
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